Applied Mechanics and Materials Vols. 263-266

Abstract: This paper deals with the emerging compressive sensing theory applied to reconstruction of the spatial distribution of a magnetic/electric field corrupted by additive noise. A typical application could be monitoring of the electromagnetic environment of a wide area where an electromagnetic source or susceptible electric/electronic apparatus are located. To this end, wireless field sensors can be assumed to be deployed over the monitored area and used to provide spatial samples of the field. The main advantages offered by compressive sensing include a number of sensors much smaller than the number foreseen by the traditional Shannon sampling theory, and the possibility to resort to nonuniform distribution of the sensors. A specific numerical analysis is devoted to investigate the effects of additive noise introduced by wireless technology, including quantization noise featuring low-cost sensors, environment and electronic noise.

Abstract: Wireless power transfer through magnetic resonance is a new technology which attracts the attention of researchers widely. At present, three theories are put forward to explain the essence of it, namely coupled-mode theory, circuit-coupled theory and magnetic dipole theory. The theories have their unique advantages and disadvantages. In this paper, comparison between different theories will be put in order to find out the best area that one theory can apply to.

Abstract: This paper presents a fault diagnosis method for nonlinear analog circuit based on multifractal detrended fluctuation analysis (MFDFA) method. The MFDFA method is applied to analysis fault signal and extracts the multifractal features from the raw signal. The selected features are given to SVM classifier for further classification. The data required to develop the classifier are generated by simulating various faults using Pspice software. The simulation results show that the proposed method provides a robust and accurate method for nonlinear circuit fault diagnosis.

Abstract: This paper discusses the ladder simulation of the OTA-C filter. The OTA used in the type of filter is given. And the analysis of the implemented steps is introduced in detail. The given example shows that the OTA-C filter can adjust the cutoff frequency and easy to integrate using the method.

Abstract: In this system,the literacy controller of SD card by SPI interface is designed based on FPGA.The overall design is realized in Nios II soft processor with C/C++ language,and the technology of First In First Out is used to solve timing problems,and then ultimately the overall design features are realized.This design takes advantages of the features of FPGA,which has reduction in development time,an efficient data processing,and other characteristics.The successful application in data storage collected by the audio chips shows that the design is feasible and valid.

Abstract: Short-term load forecasting is one of the most important routine works for power dispatch departments. The accuracy of load forecasting will exert direct effects on the safety, economy and stabilization of the power system running. Portrait and transverse comparability are employed to distinguish and correct bad load data, while wavelet analysis and multiple-time-period analysis used to eliminate long-term increasing weights, thus reducing the impact of the high-speed load increase on the accuracy of load forecasting.

Abstract: Multiple type recurrent event data is often observed in clinical medicine, epidemiology, biostatistics, and other related applied research fields. This paper presents an additive-accelerated hazard ratio model for multiple type recurrent events data, and gives the estimation methods of unknown parameter and non-parameter function based on the idea of estimating equation. In addition, it provides the expression of unknown regression coefficient as well as the benchmark hazard ratio function.

Abstract: In this paper, we account for efficient approach of direction-of-arrival estimation based on sparse reconstruction of sensor measurements with an overcomplete basis. MSD-FOCUSS ( MMV Synchronous Descending FOCal Underdetermined System Solver) algorithm is developed against to sparse reconstruction in multiple-measurement-vectors (MMV) system where noise perturbations exist in both the measurements and sensing matrix. The paper shows how sparse-signal model of DOA estimation is established and MSD-FOCUSS is derived, then the simulation results illustrate the advantage of MSD-FOCUSS when it is used to solve the problem of DOA estimation.

Abstract: Digital signal processing (DSP) has become one of key enabling technologies for communications, condition monitoring, multimedia computing, wireless networks and other areas requiring signal and information processing. With the rapid growth of applications of digital signal processing in the world, it has become necessary to introduce these concepts to graduates and undergraduates. Teaching of digital signal processing is carried out not only at the electrical and electronic engineering departments as the most traditional interested in this subject, but also others technical universities are carried out lectures and tutorials. In this paper, a digital signal processing development process is described. It starts from the conceptual algorithm design and computer simulation using MATLAB. After verification of the algorithm, a fixed-point C program is developed for a specific fixed-point DSP processor. This application covers most topics included in a DSP courses performing independent multiple simple experiments. The used methodology enables students and engineers to understand and develop complex fixed-point applications on hardware implementations.

Abstract: Introduced the design and realization method about the serial data converted and loaded to ADSP TS101 Link Port. According to the serial data transmission protocol and practical application, it used UART method to receive differential serial data. According to Link Port communication protocol designed a sequence to load data. It designed that serial data converted and loaded to Link Port based on FPGA. Researched the method based on hardware circuit designing and realization. According to the UART and Link Port protocol, the software was designed to realize demanding function. The practical application shows that this method can reliably achieved the foundations of serial data converted and loaded to Link Port. It has not carried out any data loss, distortion, or other phenomenon.